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(9x-13)=90
We move all terms to the left:
(9x-13)-(90)=0
We get rid of parentheses
9x-13-90=0
We add all the numbers together, and all the variables
9x-103=0
We move all terms containing x to the left, all other terms to the right
9x=103
x=103/9
x=11+4/9
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